> The BDB environment (__db.*) is located on disk, rather than in memory.
With the shared memory BDB environment, the BDB memory pool resides
in the shared memory, while with the file-backed memory mapping, the BDB
memory pool is backed by files.
In this sense, it would be more appropriate to use the terminology "file-backed
DB caching" / "shared memory DB caching" instead of "disk caching" / "memory caching".
- Jong